Added buttons to toggle arrow visibility and arrow pointing direction, added property 'borderColor' to test 'visual artifacts' at arrowSize=0, added property 'arrowHeightFactor' to change arrow's width/height-ratio, change customizeTheme to be uglier (just for testing)
Merge branch 'fix-#21' of git://github.com/mrackwitz/SDSegmentedControl into mrackwitz-fix-#21
Use accessors instead of direct ivar